I Don’t Want To Reincarnate - Chapter 858 - : 859, Bian Shishi, the hero of the whole thing

Akira Kisaragi traverses into the Bleach world, unlocking a check-in system.He initially thought that by checking in daily, he could become stronger, soon become the Captain-Commander, join Division Zero, punch Yhwach, kick the Soul King, and marry Unohana...However, the system's style wasn't quite what he had imagined.〈 Check-in complete, obtained Genryūsai Yamamoto's secret roasted sweet potato! 〉〈 Check-in complete, obtained exclusive attribute: King of Normal Attacks, effect... 〉〈 Check-in complete, obtained Retsu Unohana's... 〉Akira's eyes suddenly lit up!“Seems like this might not be so bad after all!”

A scientific genius named Thomas Harrier was transmigrated to an imperial prince body after a car accident that took his life. He found out that he is in a world similar to our own with a timeline akin to early twentieth century. The body that he is occupying was the imperial prince of a failing empire who suddenly rose to power after a successful assassination attempt of his father. Unaware that the attack is just the beginning of what is to come. He faces many challenges throughout. Will Thomas Harrier be able to live his second life in peace while running an empire and getting it back to its former glory? Or will he succumb into a conspiracy lurking within the country's borders?

Expect some:

Cold war era techs.

Super battleship with advanced electronics, propulsion, and fire control systems?
Helicopters?
Missiles?
Modern medicines and equipment?
AC-130?
A nuke?
Challenger or Abrams or Leopard?
F-4 Phantom or MIG-21?
Colored TV's.

Everything!!!

PS. Cover not mine, I just found it on google.

After traveling for three years, Lin Yu was drawn into a horror game unexpectedly.

However, he discovered one thing.

The dungeon boss feared by countless players turned out to be the little loli who called her big brother next door.

then.

In the horror hospital, the director of the hospital turned out to be the uncle downstairs who made him and his granddaughter fall in love.

In the bloody slaughterhouse, the existence known as the bloody butcher turned out to be the uncle upstairs who wanted him to be his brother-in-law.

In Changteng Ghost School, the woman who frightens countless students is actually the long-legged sister Yu who invites her to her house for dinner whenever she has nothing to do.

…

Traveling through three years, you told me that this place is actually a horror game world?

(Introduction is weak, please read the text)

- Description from novelbuddy

The once-bustling and noisy streets were now filled with an eerie blanket of silence.

Hoarse and frenzied whispers lingered high above the heavens, and an indescribable ancient giant lurked in the shadows of the bottomless ocean.

A mysterious plague had outbroken, and natural disasters wrought the Earth. Global pandemic and catastrophes had the panicked masses seeking illusory shelters from the devastation, day and night.

A bloody shower poured over the land as the streaks of lightning tore across the sky, illuminating the ill-intentioned gathering of ravens above. Nevermore, nevermore, quoth the ravens.

“We can see that this malformed creature has twelve pairs of ribs like humans, but also has a “transverse bone” that humans do not possess…”

In the medical school, Gu Jun continued bringing down his scalpel, illustrating the abnormal thoracic structure of the malformed cadaver on the dissection table to the surrounding students.

Ominous and treacherous times had descended! Truth and logic had crumbled, order warped into a frenzy. Humanity can only forge ahead through the power of intelligence and wisdom.